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Fig. 2. Average aboveground biomass (g m-2) for treatments sampled in 1998 and 1999. Least significant difference (LSD) among treatments for total biomass is represented by letter(s) above each bar, at 
= 0.05. The LSD separation for grasses and forbs among treatments is represented by letter(s) within each bar, at = 0.05. The LSD represents mean separation within each year. Different letters among treatments represent significant differences. Treatment codes: M, mushroom compost; B, biosolids; S, stockpiled topsoil; N, nonstockpiled topsoil; P, ProMac; C, capillary barrier.
